Steel plate sprocket and method of producing same

Metal working – Method of mechanical manufacture – Gear making

Reexamination Certificate

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C029S893330, C072S352000, C072S354600, C072S355200

Reexamination Certificate

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07634857

ABSTRACT:
A sprocket is formed by fine-blanking a steel plate using a die having a cutting edge shaped to produce rounded edges on the back sides of the sprocket tooth heads, and protrusions on the front sides. Thereafter the edges of the front sides of the sprocket tooth heads are formed in a press so that the protrusions are removed, and the edges of the front sides of the sprocket tooth heads have a rounded cross-sectional shape substantially the same as that of the edges of the front sides.

REFERENCES:
patent: 2224993 (1940-12-01), Swift et al.
patent: 3796085 (1974-03-01), Fisher et al.
patent: 4248075 (1981-02-01), Whitley
patent: 4569263 (1986-02-01), Kravets
patent: 4876876 (1989-10-01), Ishida et al.
patent: 6209381 (2001-04-01), Yaguchi et al.
patent: 6370931 (2002-04-01), Bennett
patent: 6729172 (2004-05-01), Aizaki
patent: 7526862 (2009-05-01), Leveque et al.
patent: 2006/0042341 (2006-03-01), Nishibu
patent: 58074231 (1983-05-01), None
patent: 2002-001449 (2002-01-01), None

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